wrp/wrp.go

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//
// WRP - Web Rendering Proxy
//
// Copyright (c) 2013-2018 Antoni Sawicki
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// Copyright (c) 2019-2022 Google LLC
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//
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package main
import (
"bytes"
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"context"
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"embed"
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"flag"
"fmt"
"html/template"
"image"
"image/color/palette"
"image/gif"
"image/png"
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"io/ioutil"
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"log"
"math"
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"math/rand"
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"net/http"
"net/url"
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"os"
"os/signal"
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"strconv"
"strings"
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"syscall"
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"time"
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"github.com/MaxHalford/halfgone"
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"github.com/chromedp/cdproto/css"
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"github.com/chromedp/cdproto/emulation"
"github.com/chromedp/cdproto/page"
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"github.com/chromedp/chromedp"
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"github.com/soniakeys/quant/median"
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)
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const version = "4.6.0"
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var (
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addr = flag.String("l", ":8080", "Listen address:port, default :8080")
headless = flag.Bool("h", true, "Headless mode - hide browser window")
debug = flag.Bool("d", false, "Debug ChromeDP")
noDel = flag.Bool("n", false, "Do not free maps and images after use")
defType = flag.String("t", "gif", "Image type: gif|png")
fgeom = flag.String("g", "1152x600x216", "Geometry: width x height x colors, height can be 0 for unlimited")
htmFnam = flag.String("ui", "wrp.html", "HTML template file for the UI")
delay = flag.Duration("s", 2*time.Second, "Delay/sleep after page is rendered and before screenshot is taken")
srv http.Server
ctx context.Context
cancel context.CancelFunc
img = make(map[string]bytes.Buffer)
ismap = make(map[string]wrpReq)
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defGeom geom
htmlTmpl *template.Template
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)
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//go:embed *.html
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var fs embed.FS
type geom struct {
w int64
h int64
c int64
}
// Data for html template
type uiData struct {
Version string
URL string
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BgColor string
NColors int64
Width int64
Height int64
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Zoom float64
ImgType string
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ImgURL string
ImgSize string
ImgWidth int
ImgHeight int
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MapURL string
PageHeight string
}
// Parameters for HTML print function
type printParams struct {
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bgColor string
pageHeight string
imgSize string
imgURL string
mapURL string
imgWidth int
imgHeight int
}
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// WRP Request
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type wrpReq struct {
url string // url
width int64 // width
height int64 // height
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zoom float64 // zoom/scale
colors int64 // #colors
mouseX int64 // mouseX
mouseY int64 // mouseY
keys string // keys to send
buttons string // Fn buttons
imgType string // imgtype
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w http.ResponseWriter
r *http.Request
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}
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// Parse HTML Form, Process Input Boxes, Etc.
func (rq *wrpReq) parseForm() {
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rq.r.ParseForm()
rq.url = rq.r.FormValue("url")
if len(rq.url) > 1 && !strings.HasPrefix(rq.url, "http") {
rq.url = fmt.Sprintf("http://www.google.com/search?q=%s", url.QueryEscape(rq.url))
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}
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rq.width, _ = strconv.ParseInt(rq.r.FormValue("w"), 10, 64)
rq.height, _ = strconv.ParseInt(rq.r.FormValue("h"), 10, 64)
if rq.width < 10 && rq.height < 10 {
rq.width = defGeom.w
rq.height = defGeom.h
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}
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rq.zoom, _ = strconv.ParseFloat(rq.r.FormValue("z"), 64)
if rq.zoom < 0.1 {
rq.zoom = 1.0
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}
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rq.colors, _ = strconv.ParseInt(rq.r.FormValue("c"), 10, 64)
if rq.colors < 2 || rq.colors > 256 {
rq.colors = defGeom.c
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}
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rq.keys = rq.r.FormValue("k")
rq.buttons = rq.r.FormValue("Fn")
rq.imgType = rq.r.FormValue("t")
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if rq.imgType != "gif" && rq.imgType != "png" {
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rq.imgType = *defType
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}
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log.Printf("%s WrpReq from UI Form: %+v\n", rq.r.RemoteAddr, rq)
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}
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// Display WP UI
func (rq *wrpReq) printHTML(p printParams) {
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rq.w.Header().Set("Cache-Control", "max-age=0")
rq.w.Header().Set("Expires", "-1")
rq.w.Header().Set("Pragma", "no-cache")
rq.w.Header().Set("Content-Type", "text/html")
data := uiData{
Version: version,
URL: rq.url,
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BgColor: p.bgColor,
Width: rq.width,
Height: rq.height,
NColors: rq.colors,
Zoom: rq.zoom,
ImgType: rq.imgType,
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ImgSize: p.imgSize,
ImgWidth: p.imgWidth,
ImgHeight: p.imgHeight,
ImgURL: p.imgURL,
MapURL: p.mapURL,
PageHeight: p.pageHeight,
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}
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err := htmlTmpl.Execute(rq.w, data)
if err != nil {
log.Fatal(err)
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}
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}
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// Determine what action to take
func (rq *wrpReq) action() chromedp.Action {
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// Mouse Click
if rq.mouseX > 0 && rq.mouseY > 0 {
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log.Printf("%s Mouse Click %d,%d\n", rq.r.RemoteAddr, rq.mouseX, rq.mouseY)
return chromedp.MouseClickXY(float64(rq.mouseX)/float64(rq.zoom), float64(rq.mouseY)/float64(rq.zoom))
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}
// Buttons
if len(rq.buttons) > 0 {
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log.Printf("%s Button %v\n", rq.r.RemoteAddr, rq.buttons)
switch rq.buttons {
case "Bk":
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return chromedp.NavigateBack()
case "St":
return chromedp.Stop()
case "Re":
return chromedp.Reload()
case "Bs":
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return chromedp.KeyEvent("\b")
case "Rt":
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return chromedp.KeyEvent("\r")
case "<":
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return chromedp.KeyEvent("\u0302")
case "^":
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return chromedp.KeyEvent("\u0304")
case "v":
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return chromedp.KeyEvent("\u0301")
case ">":
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return chromedp.KeyEvent("\u0303")
}
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}
// Keys
if len(rq.keys) > 0 {
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log.Printf("%s Sending Keys: %#v\n", rq.r.RemoteAddr, rq.keys)
return chromedp.KeyEvent(rq.keys)
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}
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// Navigate to URL
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log.Printf("%s Processing Capture Request for %s\n", rq.r.RemoteAddr, rq.url)
return chromedp.Navigate(rq.url)
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}
// Process Keyboard and Mouse events or Navigate to the desired URL.
func (rq *wrpReq) navigate() {
err := chromedp.Run(ctx, rq.action())
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if err != nil {
if err.Error() == "context canceled" {
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log.Printf("%s Contex cancelled, try again", rq.r.RemoteAddr)
fmt.Fprintf(rq.w, "<BR>%s<BR> -- restarting, try again", err)
ctx, cancel = chromedp.NewContext(context.Background())
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return
}
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log.Printf("%s %s", rq.r.RemoteAddr, err)
fmt.Fprintf(rq.w, "<BR>%s<BR>", err)
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}
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}
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// https://github.com/chromedp/chromedp/issues/979
func chromedpCaptureScreenshot(res *[]byte, h int64) chromedp.Action {
if res == nil {
panic("res cannot be nil")
}
if h == 0 {
return chromedp.CaptureScreenshot(res)
}
return chromedp.ActionFunc(func(ctx context.Context) error {
var err error
*res, err = page.CaptureScreenshot().Do(ctx)
return err
})
}
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func gifPalette(i image.Image, n int64) image.Image {
switch n {
case 2:
i = halfgone.FloydSteinbergDitherer{}.Apply(halfgone.ImageToGray(i))
case 216:
var FastGifLut = [256]int{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5}
r := i.Bounds()
// NOTE: the color index computation below works only for palette.WebSafe!
p := image.NewPaletted(r, palette.WebSafe)
if i64, ok := i.(image.RGBA64Image); ok {
for y := r.Min.Y; y < r.Max.Y; y++ {
for x := r.Min.X; x < r.Max.X; x++ {
c := i64.RGBA64At(x, y)
r6 := FastGifLut[c.R>>8]
g6 := FastGifLut[c.G>>8]
b6 := FastGifLut[c.B>>8]
p.SetColorIndex(x, y, uint8(36*r6+6*g6+b6))
}
}
} else {
for y := r.Min.Y; y < r.Max.Y; y++ {
for x := r.Min.X; x < r.Max.X; x++ {
c := i.At(x, y)
r, g, b, _ := c.RGBA()
r6 := FastGifLut[r&0xff]
g6 := FastGifLut[g&0xff]
b6 := FastGifLut[b&0xff]
p.SetColorIndex(x, y, uint8(36*r6+6*g6+b6))
}
}
}
i = p
default:
q := median.Quantizer(n)
i = q.Paletted(i)
}
return i
}
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// Capture currently rendered web page to an image and fake ISMAP
func (rq *wrpReq) capture() {
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var err error
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var styles []*css.ComputedStyleProperty
var r, g, b int
var h int64
var pngcap []byte
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chromedp.Run(ctx,
emulation.SetDeviceMetricsOverride(int64(float64(rq.width)/rq.zoom), 10, rq.zoom, false),
chromedp.Location(&rq.url),
chromedp.ComputedStyle("body", &styles, chromedp.ByQuery),
chromedp.ActionFunc(func(ctx context.Context) error {
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_, _, _, _, _, s, err := page.GetLayoutMetrics().Do(ctx)
if err == nil {
h = int64(math.Ceil(s.Height))
}
return nil
}),
)
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for _, style := range styles {
if style.Name == "background-color" {
fmt.Sscanf(style.Value, "rgb(%d,%d,%d)", &r, &g, &b)
}
}
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log.Printf("%s Landed on: %s, Height: %v\n", rq.r.RemoteAddr, rq.url, h)
height := int64(float64(rq.height) / rq.zoom)
if rq.height == 0 && h > 0 {
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height = h + 30
}
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chromedp.Run(
ctx, emulation.SetDeviceMetricsOverride(int64(float64(rq.width)/rq.zoom), height, rq.zoom, false),
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chromedp.Sleep(*delay), // TODO(tenox): find a better way to determine if page is rendered
)
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// Capture screenshot...
err = chromedp.Run(ctx, chromedpCaptureScreenshot(&pngcap, rq.height))
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if err != nil {
if err.Error() == "context canceled" {
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log.Printf("%s Contex cancelled, try again", rq.r.RemoteAddr)
fmt.Fprintf(rq.w, "<BR>%s<BR> -- restarting, try again", err)
ctx, cancel = chromedp.NewContext(context.Background())
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return
}
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log.Printf("%s Failed to capture screenshot: %s\n", rq.r.RemoteAddr, err)
fmt.Fprintf(rq.w, "<BR>Unable to capture screenshot:<BR>%s<BR>\n", err)
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return
}
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seq := rand.Intn(9999)
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imgpath := fmt.Sprintf("/img/%04d.%s", seq, rq.imgType)
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mappath := fmt.Sprintf("/map/%04d.map", seq)
ismap[mappath] = *rq
var ssize string
var iw, ih int
switch rq.imgType {
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case "gif":
i, err := png.Decode(bytes.NewReader(pngcap))
if err != nil {
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log.Printf("%s Failed to decode PNG screenshot: %s\n", rq.r.RemoteAddr, err)
fmt.Fprintf(rq.w, "<BR>Unable to decode page PNG screenshot:<BR>%s<BR>\n", err)
return
}
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st := time.Now()
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var gifbuf bytes.Buffer
err = gif.Encode(&gifbuf, gifPalette(i, rq.colors), &gif.Options{})
if err != nil {
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log.Printf("%s Failed to encode GIF: %s\n", rq.r.RemoteAddr, err)
fmt.Fprintf(rq.w, "<BR>Unable to encode GIF:<BR>%s<BR>\n", err)
return
}
img[imgpath] = gifbuf
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ssize = fmt.Sprintf("%.0f KB", float32(len(gifbuf.Bytes()))/1024.0)
iw = i.Bounds().Max.X
ih = i.Bounds().Max.Y
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log.Printf("%s Encoded GIF image: %s, Size: %s, Colors: %d, Res: %dx%d, Time: %vms\n", rq.r.RemoteAddr, imgpath, ssize, rq.colors, iw, ih, time.Since(st).Milliseconds())
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case "png":
pngbuf := bytes.NewBuffer(pngcap)
img[imgpath] = *pngbuf
cfg, _, _ := image.DecodeConfig(pngbuf)
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ssize = fmt.Sprintf("%.0f KB", float32(len(pngbuf.Bytes()))/1024.0)
iw = cfg.Width
ih = cfg.Height
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log.Printf("%s Got PNG image: %s, Size: %s, Res: %dx%d\n", rq.r.RemoteAddr, imgpath, ssize, iw, ih)
}
rq.printHTML(printParams{
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bgColor: fmt.Sprintf("#%02X%02X%02X", r, g, b),
pageHeight: fmt.Sprintf("%d PX", h),
imgSize: ssize,
imgURL: imgpath,
mapURL: mappath,
imgWidth: iw,
imgHeight: ih,
})
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log.Printf("%s Done with capture for %s\n", rq.r.RemoteAddr, rq.url)
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}
// Process HTTP requests to WRP '/' url
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func pageServer(w http.ResponseWriter, r *http.Request) {
log.Printf("%s Page Request for %s [%+v]\n", r.RemoteAddr, r.URL.Path, r.URL.RawQuery)
rq := wrpReq{
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r: r,
w: w,
}
rq.parseForm()
if len(rq.url) < 4 {
rq.printHTML(printParams{bgColor: "#FFFFFF"})
return
}
rq.navigate()
rq.capture()
}
// Process HTTP requests to ISMAP '/map/' url
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func mapServer(w http.ResponseWriter, r *http.Request) {
log.Printf("%s ISMAP Request for %s [%+v]\n", r.RemoteAddr, r.URL.Path, r.URL.RawQuery)
rq, ok := ismap[r.URL.Path]
rq.r = r
rq.w = w
if !ok {
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fmt.Fprintf(w, "Unable to find map %s\n", r.URL.Path)
log.Printf("Unable to find map %s\n", r.URL.Path)
return
}
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if !*noDel {
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defer delete(ismap, r.URL.Path)
}
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n, err := fmt.Sscanf(r.URL.RawQuery, "%d,%d", &rq.mouseX, &rq.mouseY)
if err != nil || n != 2 {
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fmt.Fprintf(w, "n=%d, err=%s\n", n, err)
log.Printf("%s ISMAP n=%d, err=%s\n", r.RemoteAddr, n, err)
return
}
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log.Printf("%s WrpReq from ISMAP: %+v\n", r.RemoteAddr, rq)
if len(rq.url) < 4 {
rq.printHTML(printParams{bgColor: "#FFFFFF"})
return
}
rq.navigate()
rq.capture()
}
// Process HTTP requests for images '/img/' url
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func imgServer(w http.ResponseWriter, r *http.Request) {
log.Printf("%s IMG Request for %s\n", r.RemoteAddr, r.URL.Path)
imgbuf, ok := img[r.URL.Path]
if !ok || imgbuf.Bytes() == nil {
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fmt.Fprintf(w, "Unable to find image %s\n", r.URL.Path)
log.Printf("%s Unable to find image %s\n", r.RemoteAddr, r.URL.Path)
return
}
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if !*noDel {
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defer delete(img, r.URL.Path)
}
switch {
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case strings.HasPrefix(r.URL.Path, ".gif"):
w.Header().Set("Content-Type", "image/gif")
case strings.HasPrefix(r.URL.Path, ".png"):
w.Header().Set("Content-Type", "image/png")
}
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w.Header().Set("Content-Length", strconv.Itoa(len(imgbuf.Bytes())))
w.Header().Set("Cache-Control", "max-age=0")
w.Header().Set("Expires", "-1")
w.Header().Set("Pragma", "no-cache")
w.Write(imgbuf.Bytes())
w.(http.Flusher).Flush()
}
// Process HTTP requests for Shutdown via '/shutdown/' url
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func haltServer(w http.ResponseWriter, r *http.Request) {
log.Printf("%s Shutdown Request for %s\n", r.RemoteAddr, r.URL.Path)
w.Header().Set("Cache-Control", "max-age=0")
w.Header().Set("Expires", "-1")
w.Header().Set("Pragma", "no-cache")
w.Header().Set("Content-Type", "text/plain")
fmt.Fprintf(w, "Shutting down WRP...\n")
w.(http.Flusher).Flush()
time.Sleep(time.Second * 2)
cancel()
srv.Shutdown(context.Background())
os.Exit(1)
}
// returns html template, either from html file or built-in
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func tmpl(t string) string {
var tmpl []byte
fh, err := os.Open(t)
if err != nil {
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goto builtin
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}
tmpl, err = ioutil.ReadAll(fh)
if err != nil {
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goto builtin
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}
log.Printf("Got UI template from %v file\n", t)
return string(tmpl)
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builtin:
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fhs, err := fs.Open("wrp.html")
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if err != nil {
log.Fatal(err)
}
tmpl, err = ioutil.ReadAll(fhs)
if err != nil {
log.Fatal(err)
}
log.Printf("Got UI template from built-in\n")
return string(tmpl)
}
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// Main...
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func main() {
var err error
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flag.Parse()
if len(os.Getenv("PORT")) > 0 {
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*addr = ":" + os.Getenv(("PORT"))
}
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n, err := fmt.Sscanf(*fgeom, "%dx%dx%d", &defGeom.w, &defGeom.h, &defGeom.c)
if err != nil || n != 3 {
log.Fatalf("Unable to parse -g geometry flag / %s", err)
}
opts := append(chromedp.DefaultExecAllocatorOptions[:],
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chromedp.Flag("headless", *headless),
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chromedp.Flag("hide-scrollbars", false),
)
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actx, acancel := chromedp.NewExecAllocator(context.Background(), opts...)
defer acancel()
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switch *debug {
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case true:
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ctx, cancel = chromedp.NewContext(actx, chromedp.WithDebugf(log.Printf))
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default:
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ctx, cancel = chromedp.NewContext(actx)
}
defer cancel()
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rand.Seed(time.Now().UnixNano())
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c := make(chan os.Signal)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
<-c
log.Printf("Interrupt - shutting down.")
cancel()
srv.Shutdown(context.Background())
os.Exit(1)
}()
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http.HandleFunc("/", pageServer)
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http.HandleFunc("/map/", mapServer)
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http.HandleFunc("/img/", imgServer)
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http.HandleFunc("/shutdown/", haltServer)
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http.HandleFunc("/favicon.ico", http.NotFound)
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log.Printf("Web Rendering Proxy Version %s\n", version)
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log.Printf("Args: %q", os.Args)
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log.Printf("Default Img Type: %v, Geometry: %+v", *defType, defGeom)
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htmlTmpl, err = template.New("wrp.html").Parse(tmpl(*htmFnam))
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if err != nil {
log.Fatal(err)
}
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log.Printf("Starting WRP http server on %s\n", *addr)
srv.Addr = *addr
err = srv.ListenAndServe()
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if err != nil {
log.Fatal(err)
}
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}